含铜镍岩浆起源及硫饱和机制:以新疆黄山南岩浆铜镍硫化物矿床Sr-Nd-Pb-S同位素和元素地球化学研究为例

发布时间：2018-05-17 18:29

  本文选题：含铜镍岩浆起源 + 硫饱和机制　； 参考：《岩石学报》2016年07期

【摘要】：新疆黄山-镜儿泉一带是天山东段重要岩浆铜镍硫化物成矿带,但对其中含铜镍岩浆起源和硫饱和机制尚存较大争议。黄山南岩体是近年来在该成矿带中发现的另一个含矿性较好的重要岩体。岩体可分为超镁铁质岩相和镁铁质岩相,超镁铁质岩相为主要含铜镍矿岩相,而镁铁质岩相并未发生明显的矿化。超镁铁质岩相岩石类型包括二辉橄榄岩、斜辉橄榄岩、橄榄二辉岩、二辉岩、角闪二辉岩及少量粗粒辉长岩,其中二辉橄榄岩和二辉岩是主要含矿岩石类型。镁铁质岩相由苏长岩、辉长岩、角闪辉长岩、闪长岩及石英闪长岩组成。黄山南岩体的(~(87)Sr/~(86)Sr)i(0.7036~0.7057)、ε_(Nd)(t)(-1.2~+7.4)、(~(206)Pb/~(204)Pb)i(17.152~18.088)、(~(207)Pb/~(204)Pb)i(15.385~15.571)和(~(208)Pb/~(204)Pb)i(37.127~38.252)变化范围均较大,显示了母岩浆遭受了较明显的壳源物质混染。岩浆源区在板片俯冲过程中壳源物质加入明显,而原始岩浆上升过程中壳源物质的混染有限。Sr-Nd-Pb同位素组成指示黄山南含矿岩体的形成与塔里木大火成岩省并无直接联系。虽然黄山南岩浆铜镍硫化物矿石δ~(34)S值介于-1.54‰~2.03‰之间,落在幔源硫的范围内,但是Se(×10~6)/S比值表明壳源硫的加入对成矿母岩浆硫饱和起到重要作用。
[Abstract]:The Huangshan-Jingerquan area of Xinjiang is an important Cu-Ni sulfide metallogenic belt in the eastern part of Tianshan Mountains, but the origin of the Cu-Ni bearing magma and the mechanism of sulfur saturation are still controversial. Huangshannan rock body is another important ore-bearing rock found in this metallogenic belt in recent years. The rock mass can be divided into ultramafic facies and mafic facies. Ultramafic lithofacies is the main copper-nickel bearing mineralogy facies, but there is no obvious mineralization in mafic rock facies. Ultramafic lithofacies rock types include lherzolite, clinopherzolite, peridotite, hornblende and a small amount of coarse-grained gabbro. The mafic facies are composed of sapphire, gabbro, hornblende, diorite and quartz diorite. In the southern Huangshan rock mass, the range of changes is large, that is, 0.7036 ~ 0.7057, -1.2-7.4, and 204Pbr / T ~ 204Pb / L ~ (17.152N) 18.0888.571) and 204Pbr / 204Pbi (37.127338.252), which shows that the magma has been contaminated by the crust material. In the plate subduction process, the crust source material was obviously added in the magmatic source area, while the mixed contamination of the crust source material during the primitive magma uplift indicated that the formation of the ore-bearing rock body in the south of Huangshan is not directly related to the Tarim igneous province. Although the 未 ~ (4) N ~ (34) S value of Cu-Ni sulphide ore from South Huangshan magma is between -1.54 鈥，

本文编号：1902399